Shows how altruists (cooperate with everyone) are exploited by other strategies. Left shows agents colored by strategy: green=altruists, red=ethnocentrics, orange=cosmopolitans, blue=egoists. Right shows exploitation heat map: bright red=being heavily exploited, dark=not exploited. Altruists cooperate with everyone but receive no reciprocation from ethnocentrics or egoists, draining their reproductive potential.